Scenario:
There is a certain manipulator in your life who used to offer to do nice things for you (like treat you to dinner) or give you gifts. It turned out that almost every single nice act of hers was followed by her asking you for a difficult favor, so that it's hard for you to say "No." Ever since you caught the pattern, you've been declining all of her invitations.

But then she gives you an early Christmas gift using a mutual friend.

You know it's impolite to not say "Thank you" but if you text her "Thank you," there is a 99 percent probability that she will say "My pleasure!" and follow it with asking you a favor. How would you respond? When someone gives you a gift and ask you for a favor, do you find it hard to say "No"?

An example of potential conversation based on years of pattern:

Me: "Thank you so much for the gift"

Her: "My pleasure! I wanted to give this to you before I go travelling this weekend. Do you think you can drive me to the airport at 5 a.m. Saturday morning?"